Expansible and contractible core for making cement conductors.



Patented Mar. 2, 1909.

M. ENGELN.

APPLICATION FILED JUNE15, 190s.

EXPANSIBLE AND GONTRAOTIBLE GORE FOR MAKING CEMENT GONDUGTORS.

Inventor Witnesses MATHLIS ENGELN, ,OF MCHENRY, ILLINOIS.

EXPANSIBLE AND CONTBAC'IIIBLE CORE FOR MAKING CEMENT CONDUCTORS;

Application filed June 15 To all whom it may ransom:

Be it known that l, NA'riirAs ENGELN, a

citizen of the United States, and a resident of lllcllenry', in the county of Mclleiiry, in the State of lllinois, have invented certain new :tllt'lUSGfUl Improvements in Expansible and (Ioiiti'actible Cores for Making Cement Conductors and I do hereby declare that the following description of my said invention, taken in connection with the accompanying sheetof drawings, forms a full, clear, and. exact specification, which will enable others skilled in the art to which it appertains to make and use the same.

This invention has general reference to improvements in expansible audcontractible cores for cement-pipe production; and it consists, essentially, in the novel and peculiar combination of parts and details of construc-v tion, as hereinafter first fully set forth and described and then pointed out in the claims. In the drawings already referred to, which serve to illustrate this invention more fully, Figure 1 is a longitudinal sectional plan. of this expansible and contractible core. Fig. 2 is an endelevation of the same. Fig. 3 is a similar view of a modified form of this device. Fig. 4 is a sideelevation, and Fig. 5 a plan of one of the collars employed in this apparatus.

Like parts are designated by cornspoiiding symbols ofref crencc in all the figures.

The object of this invention is the production of an ellicient,v serviceable and durable core-for .use in. the producti'oinorlaying of, cement-conduits or pipes, sewer-pipes, &c.

' To attain these results I construct this core of a sheet-metal cylindrical shell 2,having a widely-overlapping long tudinal seam 3 as clearly shown in the figures. Within this shell and in its central longitudinal axis there is located shaft 1, one and of which is externally screw-threaded at 5, and having at this screwthreaded end a U-shaped hail-- die 6, the members of which terminate in hooks or crooks 7, as clearly illustrated in Fig. 1. a T-handle 8, adapted to cooperate with the U-shaped handle 6 in a manner hereinafter to be referred to; said handles-being preferably formed integral with said shaft. Upon this shaft 4- there are placed a series of hubs 9,

I and near theend, and at the screw-threaded portion 5 there is placed an internally screwthreaded hub 10, all these various hubs being provided with lugsforming double-eyes, 1 1,

. Specification of Letters Patent.

, eos. Serial No. 438,580. x

The opposite end of this shaft 4 has Patented March 2, 1909.

wherein are pivoted links 12, bymeans of screws, bolts or rivets 13. On both sides of these collars 9 there areplaced locking-collars 14,, to prevent lateral movement of these collars or hubs 9 upon the shaft, 4. In the shell 2, there area series of longitudinal angle-bars" 15, securely riveted to the shell 2, and provided at proper intervals with holes through which bolts or rivets'lG are passed that connect with the links 12 at their ends hubs 9 and'lO.

The internally, screw-threaded hub 10, as well as thehubs 9, may be formed integral with the lugs or double-eyes 11 and, with the locking-collars 14 be placed upon the shaft 4 before the handle 6 is secured to said shalt. I may, however, make these collars of two similar halves, asshown in Figs. 4 and 5 where the bolts 13 serve also to securely hold serving as pivots for the links 12.

In'Fi 3 I- have shown a modification of the device heretofore described which consists in making the'shell 2 of a series of longitudiiial sections 2, 2

iicient distance to enable the sections being moved radially fromthe shaft and thereby toincrease or decrease the external diameter of the shell in a manner readily comprehended.

In sewerage work, where the sewer-piping is made of concrete or cement "in loco, that is to say in the trench, and, therefore, continu and the cement &c. placed around it to form a section of such pipe. Now another the first-placed core and the makingof the sewer-pipe &c. continued, sections of expanded cores being added as often as necessary, care being taken that the T-hiindle on the central shaft of one section properly engages the hook at the next succeeding sec-' tion, as shown in Fig. 1. When the first made section has set sufliciently to allow its core being withdrawn, the hook-formed handle 6 on the section of the core last placed into osition is turned to revolve the screw-three ed'shaft and thereby to move -a'll the hubs in the various sections into a' different angular position resulting in the draw ing inwardly o the various shells and red ucing their diameter, and by pulling the sections ahead and again expanding the shells to their the two halves together in addition to their 22, and 23, each sec-. tion overlapping its ad acent section a sufcore of the same diameter is abutted against opposite to those which engage the collars or ous, the expanded core is placed into position I original diameter the 'rnaking'of the pipin can be cont-inuedwithout, sections of the core.

adding additiona In mentioning sections v the core in the foregoing description I desire it understood that it refers to acomplete shell with-its in t'ernal parts as shown in Fig. 1 "Where-such a complete shell or section, and a short portion of an adjacent section are shown. 1o

"tio'ns will be made to suit the various diame- 'ters of piping which it is desired to produce It is evident-that the diameter of the sec and that when largediameters -are required,

I may use a greater numberwfflhubsfl and in tensionso that, after it has been'ekpanded,

it willreturn or contract to its smaller-fdiameter when the movement of the hubs and links permits of-such contraction, thereby res leasing the bolts 13 and 16 from any strain when the shellis being'contracted. a

l. have shown in Fig. 1 in dotted lines the position of the hubs and links when the shell is contracted to its smallest diameter,'-and in Fifi. 3 in dotted lines the shell in its largest diameter. It will be observed that, as shown 4 .in Fig. 1, the first set of links 12 are inclined entire shell to contract in the opposite direction of the remaining sets of links. This set of links indicated by the reference-symbols 12 and 12 and the hub 10 I" (which is the only one in the series which is internally screw-threaded) will, therefore, move in the opposite direction from those of the remaining hubs and links and that, there? fore, this set of links and their hub 10' form,

a as i were, an abutment to enable the oppositely disposed links to move and thereby the or expand, as the'case maybe;

11 order to enable the links to assume their varying angularity, the connections of the links in vthe double-eyes 11 andwith the angle-bars 15 should be somewhat loose, or in other -words, have some play, a matter which will be readily understood refer ence to Fig. 2 where the contour of t 1e shell when contracted and the positionof thelinks is shown in dotted lines. In the drawings I have shown a cylindrical shell, but it' is vi dent that the shell may be of oval, ovoid, or other similar shape if desired.

Having thus fully described my invention l claim as newand desire to secure to me by Letters Patent of the'United States 1;An expansible and collapsible core for making cement pipes in situ, consisting of a sheet-metal, .0 en i' laeamed shell having its longitudinal 'e ges overlapping; .a central, longitudinal shaft in said shell, there being a screwthreaded portion near one end of said ishaftfian o crating handle on said shaft; 'a series of 1111 s upon said shaft spaced a distance apart; a single, internally screwtion of said shaft collars fastened upon said shaft and on both silles of the before-mentioned series of hubs, there being. radiallyp'rojecting double eyes on all the said hubs; a-series of angle-bars longitudinally secured to the inner surface of said shell, and a series of links connecting the double eyes of the hubs with the angle bars in said shell.

2. In'an eXp'ansible and contractible core for making cementconductors, a metallic shell having an overlapping, longitudinal,

said shell, there being a screw-threaded orone end of said shaft; a hook-shaped handle at the other end of said shaft, and means upon-said shaft and connected with said shell-whereby the latter may be expanded and contracted.

for making cement conductors, an expantu'dinal shaft in said'shell, circular trans verse, section and having near one end a screw-threaded portion a series of hubs upon .upon said shaft on both, sides of said hubs double eyes, whereby 'said'bolts are ada ted to hold the companion halves of said hubs ito ether and form pivots for one end of said in s.

rny invention I have hereunto set my hand 11). the presence of two subscribin witnesses.

, MATHIAS E GELN. Attest:

JAMES SANFORD, J on WILSON. I

open, seam; a central, longitudinal, shaft in tical afid reversible parts; and bolts in said' ,t hreaded hub upon the screw-threaded portion near one end of said'shaft aT-hand e at .3. In an expansible and oontr'actible core sible and contractible shell; a central, longithe said shaft; a series of collars fastened an internally screw-threaded collar 11 on the In testimony that I claim the foregoing as 

